Meanwhile, Bender (who stayed behind), is hosting the 100th delivery party at Planet Express but prematurely ends it and demands everyone to leave when he realizes the remaining crew is absent. Fry attempts to reconcile with Leela, who rebuffs him. Determined to prove that he stands by Leela and mutants' plight, Fry jumps into the toxic sewage lake and emerges as a grotesque mutant blob. The crew is disgusted by Fry's new appearance, but Leela is touched by Fry's sacrifice and rallies the mutants and the crew to fight for equal rights. The mutants recruit Bender to sabotage the sewer system by bending the main sewage pipe, which sends waste up to flood the surface. While the mutants demand desegregation and equal rights from Mayor Poopenmeyer, Astor tries to force them back underground using a wave of sewage held in Madison Cube Garden, but Fry uses the 's energy to part the wave and defend the mutants. He shows the mayor and Astor the Land Titanic passenger manifest, which includes Leela's maternal grandmother, who worked on the Land Titanic when it sank. Leela's grandmother explains that Astor's husband gave up his reserved seat on the life car for her and her mother. The widowed Astor is moved and urges Mayor Poopenmeyer to support mutant equality. As he and Leela kiss over their victory, Fry's grotesque form melts away, revealing itself to be Astor's mutated husband who fell into the toxic lake and survived as the Land Titanic sunk; Fry had unknowingly lodged himself in the mutant's mouth. The Astors happily reunite, and the Planet Express crew throw another party in celebration together with Leela's family, who are now allowed access to the surface. Production The episode was written by Eric Horsted and directed by Raymie Muzquiz. In an interview, series co-producer and head writer David X. Cohen stated that the 100th episode coinciding with the season finale was unplanned, with the staff only realizing it after receiving the broadcast schedule from Comedy Central. The episode serves as the official season finale to season six, which Cohen described as being a decision made by Comedy Central. Cohen considers all twenty-six episodes of the original order to comprise season six, since all the episodes were written and produced continuously, with no production gap between "The Mutants Are Revolting" and the remaining 14 episodes. In recognition of the episode as the series' landmark